Tested on the FUN server to the date 11.10.2014
Spell name:http://www.db.pandawow.me?spell=108212/burst-of-speed
How it is bugged: Often the ability gives immunity to movement-slowing effects, mainly in the first few seconds after you cast it
How it should work: as the tooltip says, it should remove movement-slowing effect upon use, but not make yourself immune to them.
Priority: 10/10 as rogues are currently abusing it, becoming unkitable and unccable.